In green, it indicates that the lights are on, but one lamp is not working. In yellow/amber, it simply means that a lamp is out.
However, the problem here is more likely with circuitry or wiring rather than the bulb, or bulbs, itself or themselves.
Some vehicles may include a very helpful message in the instrument panel noting exactly which bulb has malfunctioned. In this case, and assuming it is a headlamp, it will also likely add whether it is low (dipped) beam, or high (main) beam. The terms low and high beam are commonly used in North America, while dipped and main beam are in more common use in Europe.
Regardless, service the lights as soon as possible.
Even with older, non-LED lighting, there is the outside possibility of a bad fuse or a broken wire or some other electrical issue affecting the headlamps. Also note that in most cases, it will be a low (dipped) beam that will likely be affected, as these spend the most time illuminated.
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Remember that only proper service and repair procedures will ensure the safe and reliable operation of your car. In addition, proper safety procedures and precautions, such as the use of safety goggles, the right tools and the equipment should be followed at all times to eliminate the possibility of personal injury or improper service which could damage the vehicle or compromise its safety.
These posts are for information sharing purposes only, and should not be used in lieu of an OEM service manual or factory authorized service procedure. We are not in the auto repair business nor do we publish automotive service manuals. Nothing we include on these pages and posts has been reviewed, approved or authorized by any vehicle manufacturer.
Technology is always changing and what is current and accurate today may be literally out-of-date and inaccurate tomorrow. And when it comes to the current state of flux in the auto industry, nothing is more true.
The author has 25 years of automotive experience and has assembled the most extensive collection of symbols and warning lights anywhere (over 1,000!) and can help you open and start any keyless start car with a dead key fob battery. BA, St. Joseph’s College, ME: MS, Rensselaer Polytechnic Institute, NY
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